--- a/configure.ac	2019-07-18 10:57:21.187376556 +0200
+++ b/configure.ac	2019-07-18 10:58:09.968379876 +0200
@@ -1611,6 +1611,9 @@
 if test $cross_compiling = no; then
    BUILD_CFLAGS="$CFLAGS $CPPFLAGS $INCLUDES -DHAVE_CONFIG_H"
    BUILD_LDFLAGS="$LDFLAGS"
+else
+   BUILD_CFLAGS="$BUILD_CFLAGS $BUILD_CPPFLAGS $INCLUDES -DHAVE_CONFIG_H"
+   BUILD_LDFLAGS="$BUILD_LDFLAGS"
 fi
 AC_SUBST(BUILD_CFLAGS)
 AC_SUBST(BUILD_LDFLAGS)
